Question

What will happen if the three members are all perpendicular to each other? No external force is applied to them.

(a) There will be a formation of one zero force member

(b) There will be a formation of two zero force member

(c) There will be a formation of three zero force member

(d) There will be no formation of zero force member

This question was addressed to me in an interview for internship.

My question is taken from Zero Force Member in section Structural Analysis of Engineering Mechanics

Answer 1

Right answer is (a) There will be a formation of one zero force member

For explanation: As far as the conditions are required for the equilibrium and for the zero force members, this joint explained will be having a zero force member. Which will be unaffected to shear stress and shear strain. Thus the zero member formation.